// Generator 应用

// 案例1：发号器
// function * createIdMaker() {
//     let id = 1
//     while(true) {
//         yield id++
//     }
// }
// const idMaker = createIdMaker()
// console.log(idMaker.next().value)
// console.log(idMaker.next().value)
// console.log(idMaker.next().value)
// console.log(idMaker.next().value)
// console.log(idMaker.next().value)
// console.log(idMaker.next().value)

const todos = {
    life: ['吃饭', '睡觉', '打豆豆'],
    learn: ['语文','数学','外语'],
    work: ['喝茶'],
    [Symbol.iterator]:function *() {
        const all = [...this.life, ...this.learn, ...this.work]
        for(const item of all) {
            yield item
        }
    }
}

for(const item of todos) {
    console.log(item)
}